All about diamond grading certificates.

All about diamond grading certificates..

When buying a diamond I urge you to buy a diamond with a diamond grading report or diamond grading certificate. These mean the same thing – and are used interchangeably.

In a different post I have discussed the differences between a diamond grading report issued by the GIA – and those issued by other diamond labs. This can be found at

The subject of this post is not the issue of different grading labs. It is the issue of diamond grading itself.

As a diamond merchant for 40+ years, and with two generations of Diamantaires before me, I urge you to understand that just because two different diamonds have the same diamond grade does not make their value equal!

One must understand that there is a range of values within each quality grade. Though this fact may mean very little with regard to diamond color it may be significant with regard to clarity grades. This is somewhat true with regard to “VS” grade diamonds and is particularly significant with regard to the “SI1” and “SI2” and “Imp” clarity grades.

With regard to stye “SI” clarity grade, there are many “SI2” diamonds that are beautiful. This is true whether viewed with our without magnification. On the other hand there are many “SI” graded diamonds that have significant black carbon imperfections that can be seen to the naked (non-magnified) eye.

Because of these differences, diamonds within these grades may trade on the wholesale diamond market for 5%-20% differences between other diamonds of the same grade.

In the retail diamond market there are retailers that prefer these “weak’ “SI” grade diamonds (meaning at the lower end of that particular clarity classification) because these are cheaper. A cheaper wholesale price can translate into a cheaper retail price and also allow the retailer to make a bigger profit margin.

These differences in the wholesale price are also evident on internet diamond sites. It is the reason why one H/SI2 diamond may be $15,000.00 and the same size diamond of the same grade may be $18,000.00.

There are diamond sellers who understand that it is not just about low price but about a beautiful diamond. One might think that these people are the “expensive” sellers. In fact these sellers may be the ones offering the real value in that they are working within their profession or trade to better serve you with a better diamond!

Take a look at the diamond. Use your eyes. Use a magnifying “loupe” or microscope. Take a good look at the diamond grading certificate. Look at the “plot” that is on the grading report. You can see these differences quite easily.

In some cases, even though you may know very little about diamond grading, you will see that one diamond may have only a slight white inclusion (Yes, it is my opinion that this is the one you should want!) – and another diamond may contain many black imperfections. Most people do not want black carbon inclusions or black carbon imperfections in their diamond. This is usually the reason why one diamond is more expensive than another – even if the grading is the same!

As a potential retail or internet diamond buyer, one must understand that it is difficult to put on paper what the eye sees or to otherwise describe the beauty of a diamond in a diamond grading report. We are not talking about automobiles that are assembled in a factory. We are talking about diamonds. Every diamond is unique. Every diamond has it’s unique inclusions.

Trying to categorize diamonds by diamond grading is like trying to categorize a beautiful woman. Diamonds are creations of nature. Like beautiful flowers or sunsets or a beautiful woman, beauty and the elements that make up beauty cannot simply be classified by categories or be understood by a diamond grading report.

Pay attention to the diamond that you are buying. Do not simply rely on the diamond grading report to ascertain value. The real value of a diamond is based on it’s beauty and it’s own unique characteristics – and not simply in a piece of paper that attempts to describe it!

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